Textile drawing mechanism



Sept. 14, 1965 F. KUBLER ETAL TEXTILE DRAWING MECHANISM 5 Sheets-Sheet 1 Filed May 9. 1962 v INVEN'EORS.

fii'edn'c' Kazfer BY Ernsf Daus'c'k WW If Sept. 14, 1965 F. KUBLER ETAL TEXTILE DRAWING MECHANISM 5 Shoots-Shoot 2 Filed llay 9, 1962 INVENTORS. Frz'edrt'c/z fi'aZ/er BY Errzs/ Daasck QM yr 4 F. KUBLER ETAL TEXTILE DRAWING MEOHANiSM Sept. 14, 1965 5 Sheets-Shoot 3 Filed lay 9, 1962 INVENTORS. Frl'edrz'cfi lrzzzr- BY Ernsi Daasc @(M/ K /4 Sept. 14, 1965 F. KUBLER ETAL TEXTILE nnmmc uncmmsu s sums-sum 4 Filed lay 9, 1962 INVENTORS' Frz'edn' K'/r BY Eras! Dauscb.

Sept. 14, 1965 F. KUBLER ETAL TEXTILE DRAWING MECHANISM Filed May 9, 1962 5 Sheets-Sheet 5 INVENTORS. Hz'edrz'c'k [fizz/er BY Eras! DauSc/L @4141 Z 4,

United States Patent 3,205,539 TEXTILE DRAWING. MECHANISM Friedrich Kiiblcr, Stuttgart-Bad Cnunstatt, and Ernst Dausch, Stuttgart, Germany, assignors to SKF Kugel- Ingerfabriken Gesellschal' t mit bcschrankter Haftung, Stuttgart-Bad" Cannstatt, Germany, a company of Germany Filed May 9, 1962, Ser. No. 193,557

Claims priority, application Germany, May 13, 1961,

5 Claims. (Cl. 19-267) This invention relates to textile machinery, and particularly to drawing mechanisms for spinning machines and the like.

More specifically, this invention is concerned with improvements in the type of drawing mechanism which employs two sets of cooperating rollers. One set, hereinafter referred to as bottom rollers, is mounted on the machine frame for rotation about substantially fixed axes. The other set of rollers is referred to as top rollers without necessarily implying that the top rollers are mounted above the bottom rollers. The top rollers are mounted on a common carrier arm pivoted to the machine frame.

A sliver of fibrous material or the like is drawn by passage between the cooperating rollers of the two sets. The general path of the sliver between the rollers will be referred to hereinafter as the drawing area. The operating characteristics of the drawing mechanism under otherwise similar conditions are determined by the pressure exerted by the rollers on the passing sliver. Since the axes of the bottom rollers are usually fixed, this pressure is generated by movement of the top rollers toward the drawing area.

For illustration, reference will be had generally to a drawing mechanism having three top rollers, namely a drawing-in roller, a middle roller, and a front roller arranged in this sequence along the path of the fibrous material, but the invention is not limited to apparatus having any specific number of rollers, but is useful in any drawing arrangement in which the number of top rollers sequentially engaging the sliver is greater than one. It is conventional to use twin rollers integrally joined by a common shaft, and the term roller as used hereinafter will be understood to cover a single roller as well as a plurality of rollers fixedly connected for rotation about a common axis.

The object of the invention is the provisionof a drawing mechanism in which the pressure exerted by at least one of the several sequentially arranged top rollers on the sliver being drawn may be adjusted substantially without altering the pressure of the other rollers.

A more specific object is the provision of means for altering the pressure of individual top rollers while the mechanism is operating.

With these and other objects in view, as will hereinafter appear, the invention in one of its aspects interposesyieldably resilient pressure means between the carrier arm of the mechanism and one top roller which is movably mounted on the arm. A pressure fluid actuated motor on the machine frame acts on motion transmitting means associated with the carrier arm to move another top roller also mounted on the arm toward the drawing area under the pressure of the fluid.

Other features and many of the attendant advantages of this invention will be readily appreciated as the same becomes better understood by reference to the following detailed description of preferred embodiments thereof when considered in connection with the accompanying drawings in which like reference numerals designate like parts throughout the figures, and wherein:

FIG. 1 is a schematic fragmentary sectioned elevation Patented Sept. 14, 1965 of a spinning machine equipped with a drawing mechanism of the invention; I

FIG. 2 illustrates another drawing mechanism of the invention in an elevationally sectional view;

FIG. 3 shows a portion of the device of FIG. 2 in the inoperative position thereof;

FIG. 4 is a fragmentary elevational section of the apparatus of FIG. 2 taken on the line IV-IV;

FIG. 5 shows a modification of the apparatus of FIG. 2 in a corresponding detail view;

FIG. 6 shows a device of FIG. 5 in its inoperative position;

FIG. 7 shows a further modification of the apparatus of FIG. 2 in a view corresponding to that of FIG. 5;and

FIG. 8 illustrates the device of FIG. 7 in its inoperative position.

Referring to FIG. 1, there is seen an elongated carrier arm 1, one longitudinal end portion of which is rotatable on a cylindrical bar 2. The bar 2 is an element of the stationary support frame 50 of the spinning machine. The arm 1 is shown in FIG. 1 in its operative position from which it may move in the direction of the arrow A into its inoperative position. Three top rollers 3, 4, 5 mounted on the free end portion of the arm 1 respectively cooperate in the operative position of the arm with three bottom rollers 3, 4, 5' which are mounted on the machine frame in a manner well-known, by itself irrelevant to this invention and therefore not illustrated. The drawing area in the apparatus illustrated is defined by a common tangential plane drawn on the bottom rolls 3', 4, 5'. A sliver 6 travels in this plane in the direction of the arrow.

The several top rollers are rotatable about respective axes spaced in the direction of elongation of the arm 1 and parallel to the longitudinal axis of the bar 2. They are each supported on one end of a guide arm, 7 or 711 the other end of each being hooked about a pivot pin 9 on the arm 1. The arms 7 and the top rollers mounted thereon may thus pivot about the axes of the pins 9 toward and away from the drawing area. The pins 9 are each carried by a base member 8, 8, 8' the longitudinal position of which relative to the arm 1 is adjustable by sliding movement along guide rails 17 on the arm 1.

The adjusted position of the base members 8, 8, 8' may' be secured by set screws 51.

The free end portion of the carrier arm 1 has substantially the shape of a downwardly open trough, and each of the base members 8, 8, 8' has a corresponding shape of reduced cross sectional dimensions and of substantially reduced length. Helical compression springs 10 are interposed between the two guide arms 7 carrying the middle top roller 4 and the drawing-in roller 5, respectively, and the inverted bottoms of the corresponding base members 8, 8. In the operative position of the mechanism illustrated in FIG. 1, the springs 10 urge the rollers 4, 5 with yieldably resilient pressure against the sliver 6 and the corresponding bottom rolls 4', 5'.

While the two base members 8 with the corresponding springs 10 and arms 7 provide relative resilient mountings for the top rollers 4, 5, the front top roller 3 is substantially rigidly mounted. The movement of the latter roller toward and away from the drawing area is controlled by a fluid pressure actuated motor. The bar 2 is formed with an internal cylinder space 11 in which a piston 12 is movable in a generally radial direction. Movement of the piston is actuated by a pressure fluid which may be either a gas or a liquid under pressure. The fluid is admitted to the cylinder space 11 and vented therefrom by a valve 24 in the usual manner to force the piston 12 outward of the space 11 under fluid pressure, and to permit its inward movement.

, of the piston 12. p

return movement of the bell crank lever 13.

'trated.

by a locking piston 12 to a motion transmitting linkage'consisting of two bell crank levers 13, 14 and a connecting bar 15. The bell crank lever 13 is mounted on a pivot 13a in theattachcd end portion of the carrier arm l. One of its arms abuts against the free end transmits pressure from the of the piston rod 16 and is biased by a compression spring 22 in a direction opposite to the power stroke of the piston 12. The spring 22 thus actuates the return stroke A stop 23 on the carrier arm 2 limits, the

The other arm of the bell crank lever 13 is hingedly attached to one end of the connecting bar 15 by a pivot 13b. The other end of the. bar is similarly attached by .a pivot 14b to one arm of the bell crank lever 14 which is rotatable on a pivot 14anear the forward end of the free portion of the carrier arm 1. The other arm of the lever 14 abuts against the guide arm 7a of the front top roller 3. When pressure fluid is admitted to the cylinder space 11 through the valve 24, the pressure is transmitted to the corresponding guide arm 7a, and the front roller is urged against the sliver '6. The arm'7ais practically rigid, and an extremely small angular displacement of the arm is necessary to vary the pressure of the front roller 3 over the entire pressure range required under any v practical conditions.

The positions of the base members 8, .8,'8 may be 7 shifted longitudinally of the arm 1 to adapt the mechanism for drawing different material or to different environmental conditions. In order to permit the top front roller 3 to be moved forward of the position illustrated, the connecting .bar 15 has a forward extension portion 15' to which the pivot 14b may be shifted, andto which it may be fastened in a conventional manner not further illusis locked in the operative position of FIG..1 device which consists of a bell crank lever 18 rotatable on a fixed pivot 18a on the carrier arm 1. An abutment-21 on one arm of the bell crank lever 18 is Thearml held in contact with an arm of the lever 13 either by a non-illustrated spring or by the weight of the lever 18 whose center of gravity is lower than the pivot 18a. The other arm of the lever 18 carries a cylindrical roller 19 which in the locking position of the device abuts against a face 20 of'the bar 2. The pressure exerted by the middle anddrawing-in rollers 4, on the sliver 6 in the drawing area is determined by the springs and substantially fixed fora given spring. The pressure exerted by the front roller 3 is readily raised or lowered by means of the valve 24 without affecting the pressures of the rollers 4, 5.

FIG-land in the other figures of the drawing yet to be axially spaced from each other.

' tened to each other by two axially extending pins 36, 37.

diaphragm type.

described, it will be understood that the bar '2 of a machineframe 50 carries many identical drawing mechanisms which are juxtaposed in the direction of elongation of the bar as is conventional in spinning machines.

In the drawing mechanism illustrated in FIGS. 2, 3 and 4, rigid ipe 31isan element of the stationary supporting machine frame 50'. The axially elongated cavity 1 of the pipe holds a tube 32 of yieldably resilient material.

The tube is connected to a source of pressure fluid through a valve in the manner illustrated in FIG; 1. The fluid tends to expand the tube into conforming engagement with the inner wall of the pipe 31.. The tube 31 has a radial opening 31' the'purpose of which will become presently apparent.

A plurality of brackets is fixedly clamped to the pipe 31. The brackets are spaced from each other in the direction ,of elongation of the pipe and carry respective drawing mechanisms. tical, only one willbe described. Each bracket'consists of two plates 33 which extendin respective planes which are radial with respect to the axis .of the pipe" 31 and Since these mechanisms are iden- 35a are pivotally attached to Together with respective edge the clamping members 35, 35a connected by a clamping Two clamping members 35, the pin 36, 37'respectively. portions of the plates 33, encircle the pipe 31, and are screw 34.

A carrier arm 1' is, pivoted on the pin 37. Its free portion is approximately trough shaped and downwardly open. Three base members 26,126, 26' of a cross-sectional shape of an inverted U arev mounted within the arm 1' by means of respective fastening screws 25 which pass through a longitudinal slot in the closed top of the arm 1 and permit the positions of the base members to be adjusted in the direction of elongation of the arm 1'.

The two base members 26 are of substantially identical configuration. Their central portions are fastened to the arm 1' by the screws. 25. The side portions of each base member 26 depend from the central portion and are connected by a stem 28 0f a spiral spring 28 and a pivot pin 9 on which one end of one of two guide arms 7' is journaled. The other end of these guide arms respectively supports the middle top roller 4'and the drawing-inroller 5. Abutments 29 on the arms 7' are engaged by the free ends of the spiral springs 28, whereby the top rollers 4, 5 are urged towardthe drawing areadefinedby the cooperating bottom rollers 4', 5'.

The front top roller3 is connected to the arm 1' by a substantially rigid mounting. The corresponding base member 26'- is similar to the members 26. Its dependent side portions are connected by a pivot pin 27 and an abutment pin 27'. The guide arm 7" on which the front top roller 3 is j'ournaled, has a hook shaped end which is pivoted onthe pin 27. Clockwise movement of the arm 7", as' viewed in FIG. 2, which would result in movement of the front roller 3 away from the drawing area, is limited by abutment of'the arm-7" against the pin 27'.

The pin 37 also pivotally carries a-pressure transmitting arm 38. A lateral projection 39 on the-arm 38 passes through the opening 31' in the pipe 31.. It carries a The tube constitutes a pressure fluid operated motor of the Pressure of the fluid urges the diaphragm against thecontact plate 40, and thereby tends to drive the projection 39 out of the" pipe 31 and to pivot the arm 38 on the pin 37.

As better seen from FIGS. 3 and 4, a pin 41 hingedly fastens two'elongated flat links'42 to the free end of the arm 38. The links each'have. a longitudinal slot 46 which is engaged by a stud 45. The studs are mounted on the ends of respective arms of two bell crank levers 43 of sheet metal which are rotatable on a common pivot pin 44 fixed on. the arm 1'. The other respective arms of the levers 43 are fixedly fastened to an actuating arm 47 which rests on top of the arm 1', and the free end of which carries a handle 48 near the front end of the carrier arm 1.

In the operative position of the apparatus illustrated in FIG. 2, the arm 1' is locked in position by the linkage formed by the links 42 and the levers .43. The pin 41 drives the links 42 into abutment against studs 45 under the pressure of the fluid in the tube 32 which thereby determines the pressure exerted by the front roller 3. Although an increase in the pressure of the fluid will further compress the sliver between the front rollers .3 and 3', the resulting displacement of the roller 3 is'minute in view of the thinness of the sliver and its. resistance to compressive stresses. The position of the rollers 4, 5 is'not significantly altered, and the pressure exerted by themis unchanged when the fluid pressure in the tube 32 is varied. It is solely governed by the tension of the spiralsprings 28.

1 When it is desired to move the carrier arm 1" from-the operative position into the inoperative position illustrated in FIG. 3, the handle 48 is swung in the direc- The two plates are fas- 1 tion of the arrow B, and the linkage is released from its locking position. As soon as the linkage passes a dead tends to move the arm 1' away from its operative position. This movement is stopped by abutting engagement of the levers 43 against the pipe 31.

A plate member (FIG. 3) of spring material attachedto the bracket by the clamping screw 34 normally covers the space between the two plates 33 to protect the linkage against atmospheric contamination, and abuts against the levers 43 in such a manner as to secure the actuating arm 47 in the inoperative position illustrated in FIG. 3.

A modified version of the apparatus shown in FIGS. 2 to 4 is partially illustrated in FIGS. 5 and 6, and it will be understood that the elements of the mechanism omitted from FIGS. 5 and 6 are identical with the corresponding elements described above in connection with FIGS. 2 to 4.

A supporting bar 2 which is an element of the stationary spinning machine frame carries a bracket 33' of approximately U-shaped section. The bracket is shown in FIGS. 5 and 6 in section on its central plane of symmetry. The bight portion of the bracket 33' is slotted and tightened around the bar 2' by a clamping screw 34'. The screw 34' thus connects the two leg portions of the bracket 33'. The free ends of these leg portions are also connected by a pin 37 on which a carrier arm 1" is pivotally mounted.

The bar 2' is solid. The pressure fluid actuated motor for generating the pressure exerted by the non-illustrated front top roller is provided in a separate rigid tube 31 parallel to the bar 2' and attached thereto by brackets 36' spaced along the length of the bar 2. Only one bracket is visible in FIGS. 5, 6.

A resilient tube 32 in the right tube 31" is connected to a source'of pressure fluid. It is also acted upon by a pressure transmittting member 38" which is rotatably mounted on a cylindrical face of the bar 2' and has a lateral projection 39' provided with a contact plate 40. The projection 39' passes through a radial opening in the tube 31" for engagement with the tube 32. The dimensions of the plate 40 are such that outward movement of the projection 39' under the fluid pressure in the tube 32 is limited by abutment of the plate 40 against the internal wall of the tube 31". This feature is useful in all embodiments of the invention employing a diaphragm type fluid operated motor, and is also seen in FIG. 2.

A pivot pin 41 on the free end of the pressure transmitting arm 38' is connected to a link 42 which is in turn hinged to one arm of a bell crank lever 43 pivotally fastened to a portion of the arm 1" longitudinally spaced from the pin 37 in a rearward direction. The actuating lever 47 is fixedly fastened to the lever 43 in the same manner as in the embodiment of the invention illustrated in FIGS. 2 to 4.

The modified embodiment of the invention illustrated in FIGS. 5 and 6 operates in the same manner as that shown in FIGS. 2 to 4. When the actuating arm 47 is lifted in the direction of the arrow B (FIG. 2), the arm 1" is pivoted from the operative position of FIG. 5 into the inoperative position of FIG. 6. Obviously other means "than abutting engagement between the plate 40 and the tube 32 maybe resorted to for limiting the movement of the arm 1" toward the inoperative position.

The drawing mechanism partly illustrated in FIGS. 7 and 8 has top and bottom rollers arranged substantially as shown in FIG. 2. It differs from the apparatus shown in FIGS. 5 and 6 mainly by avoiding the use of a separate bracket supporting a carrier arm. As shown in FIGS. 7 and 8 in the operative and inoperative position of the drawing mechanism respectively, the carrier arm 1a is rotatable on the supporting bar 2' coaxially with the pressure transmittting arm 38'. The arrangement illustrated in FIGS. 7 and 8 has fewer elements, but it is more difficult to remove a carrier arm 1a from the bar 2 than to remove the carrier arm 1" shown in FIGS. Sand 6 from the bracket 33' for repair or replacement.

The several embodiments of the invention illustrated and described permit control of the pressure of a front top roller entirely independently of the pressure of the other top rollers while the drawing mechanism operates. Obviously, the several base members 26, 26, 26' shown in FIG. 2 which also are parts of the structures shown in FIGS. 5 to 8, may be interchanged to provide individual pressure control for any one of several top rollers mounted on a common carrier arm, but such control is usually most important for the front roller. It will also be appreciated that any one of the top rollers may be additionally equipped with an apron of leather tapes, and the use of such aprons is specifically contemplated. The closer pressure control available in the drawing mechanisms of the invention permits such aprons to be operated at the lowest pressure consistent with their performance, and thus. to increase their useful life which is otherwise sharply curtailed by excessive operating pressures.

The several pressure control mechanisms disclosed are contained either within a hollow carrier arm, or are so closely clustered about the conventional supporting bar as not to increase the space requirements of the drawing mechanism beyond those of an otherwise similar mechanism not capable of individual pressure adjustment for a top roller.

While only individual drawing mechanisms have been illustrated it is apparent that the hydraulic or pneumatic motors which generate the pressure to be exerted by a selected top roller may control simultaneously a large number of identical mechanisms in an identical manner. The pressure variations in the front top rollers of a battery of drawing mechanisms usually require adjustment because of factors common to all mechanisms of a spinning machine, such as a change in the nature of the material being drawn or a change in atmospheric conditions. It is a particular advantage of this invention that it permits a large number of drawing mechanisms to be adjusted to different conditions by the operation of a single valve or other pressure control element.

Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

What is claimed is:

1. In a drawing mechanism for a spinning machine and the like, 1

(a) a support including an elongated hollow member having a wall and being formed with an opening in said wall,

(b) a pressure fluid actuated motor constituted by a resilient diaphragm within said hollow member, adapted to be connected to a source of fluid under pressure,

(c) bottom roller means on said support, defining a drawing area,

(d) carrier arm means including (1) an elongated carrier arm pivoted on said support for movements between an inoperative position remote from said drawing area and an operative position adjacent said drawing area,

(2) a pressure transmitting member pivoted on said support and having a portion which passes through said opening for pressure transmitting engagement with said diaphragm, and

(3) linkage means connecting said pressure transmitting member and said carrier arm, and permitting said carrier arm to be held under the pressure of said fluid in said operative position,

7 and to be urged toward said inoperative position,

(e) a front top roller and at least a single back top roller, each of said rollers being: rotatable and movably mounted on said carrier armfor cooperation with, said bottom roller means when said carrier arm is in said operative position,

(f) rigid pressure transmitting means provided. on

' said carrier arm means for directly transmitting pressure from said carrier arnr means, when in said operative position, to said front top roller, and

(g) resilient pressure transmitting means providedon said carrier arm means for transmitting pressure exerted by said resilient pressure transmitting means to said back top roller when said carrier arm means is in said operative position. I

2. In a mechanism as set forth in claim 1, said pressure transmitting member and said carrier arm being pivoted on a common axis.

3. In a mechanism asset forth in claim 1, said support including a support member having a longitudinal axis transverse of the direction of elongation of said arm member, said pressure transmitting member. being rotatable about said axis, said hollow member being elongated. in a direction substantially parallel to said longitudinal axis. a

4. In a drawing mechanism for a spinning machine and the like, in combinatiom- (a) a tubular support having a wall and a first axis, and defining an axially elongated cavity, said ,wall being formed with an opening'therein;

(b) a resilient tube in said cavity;

(c) a source of pressure fluid communicating with said tube:. Y

(d) bottom roller means defining a drawing area in fixed spatial relationship to said support;

(e) bracket means on said support;

(i) an elongated carrier arm having one end portion pivoted to said bracket means for movement of said carrier arm about a second axis substantially parallel to said first axis and radially spaced therefrom, and another end portion, said carrier arm being movable between an inoperative position of said other 'end portion remote from said drawing area, and .an operative position of saidother end portion spacedly adjacent said area;

(g)"a pressure transmitting member having one end portion mounted on said bracket means for pivotal movement about said secondaxis, and another end portion, said pressure transmitting member having a'portion extending through said opening into said cavity to cause engagement with said resilient tube;

' (h) a linkage hingedly connecting said other end portion of said pressure transmitting arm with a part of said pivoted end portion of said carrier arm'for urging the other end portionthereof toward said drawing area under the pressure of the fluid in said tube;-

(i) at least two longitudinallly spaced guide arms pivotally carried on said other end portion of said carrier'arm; n

(j) a-front top rolleriand a back top roller, each of said rollers beingrotatably mounted on one of said guide arms for pivotal movement therewith relative to said carrier arm toward and away from cooperating engagement with. said bottom roller; means;

(k) rigid pressure transmitting means including the guide arm having saidfront top roller mounted thereon, said rigidpressure transmitting means being provided on said other carrier arm end portion for directly transmitting pressure from said other carrier arm end portion to said front top roller when said other carrier arm end portionis in said operative position; g I

(1) spring means interposed between said other carrier arm end portion and the guide arm mounting said back top roller, said spring means transmitting the pressure thereof to saidback top roller guide arm.

5. In a drawing mechanism for a spinning machine,

and the like, in combination:

(a) an elongated support member-having a cylindrical.

face defining a longitudinal axis;

(b) bracket means on saidsupport member;

(c) an elongated carrier arm having two end" portions, one of said end portions being pivotally mounted on said bracket means for a swinging motion of said carrier arm perpendicularly to, said longitudinal axis;

(d) a front top roller and at least a single back top roller, said rollers being supported by the other of said end portions and being rotatable about axes spaced from each other in the direction of elongation of said carrier arm, and extending parallel to said longitudinal axis;

(e) a tubular member defining an 'elongated cavity,

said tubular member and said cavity extending spaced from, and in the direction of, said longitudinal axis, said tubular member being formed ,with an opening radiallyv communicating with said cavity;

(f) a-resilient tube in sa'idcavity;

(g) "bottom roller means cooperati rollers and defining a drawing area;

(h) a source of pressure-fluid communicating with said resilient tube;' 1

(i) a pressure transmitting member-pivotally mounted on said support member, a portion of said pressure transmitting member, spaced from said longitudinal axis, extending through said opening to cause engagement with said resilient tube; I

(j)'a pivot on said carrier arm, spaced from said longitudinal axis in a radial direction;

(k) two-armed lever means mounted on said pivot for connecting said lever means with said carrier arm; a y

(l) linkage means hingedly connectingsaid pressure transmitting member with anarm of said lever means, permitting the other arm of said lever means to swing said carrier arm from an operative position to an inoperative position, and vice versa, and permitting said carrier arm, when in said operative position, to urge said front top roller directly toward said drawing area and cooperating engagement with said bottom roller means; and

(111) spring means interposed between the other of said end portions and said back top' roller for transmitting pressure of said spring means to said back top roller. I

FOREIGN PATENTS 513,867 2/55 Italy.

DONALD w. PARKER, Primary Examiner.

mg with said top 

1. IN A DRAWING MECHANISM FOR A SPINNING MACHINE AND THE LIKE, (A) A SUPPORT INCLUDING AN ELONGATED HOLLOW MEMBER HAVING A WALL AND BEING FORMED WITH AN OPENING IN SAID WALL, (B) A PRESSURE FLUID ACTUATED MOTOR CONSTITUTED BY A RESILIENT DIAPHRAGM WITHIN SAID HOLLOW MEMBER, ADAPTED TO BE CONNECTED TO A SOURCE OF FLUID UNDER PRESSURE, (C) BOTTOM ROLLER MEANS ON SAID SUPPORT, DEFINING A DRAWING AREA, (D) CARRIER ARM MEANS INCLUDING (1) AN ELONGATED CARRIER ARM PIVOTED ON SAID SUPPORT FOR MOVEMENTS BETWEEN AN INOPERATIVE POSITION REMOTE FROM SAID DRAWING AREA AND AN OPERATIVE POSITION ADJACENT SAID DRAWING AREA, (2) A PRESSURE TRANSMITTING MEMBER PIVOTED ON SAID SUPPORT AND HAVING A PORTION WHICH PASSES THROUGH SAID OPENING FOR PRESSURE TRANSMITTING ENGAGEMENT WITH SAID DIPHRAGM, AND (3) LINKAGE MEANS CONNECTING SAID PRESSURE TRANSMITTING MEMBER AND SAID CARRIER ARM, AND PERMITTING SAID CARRIER ARM TO BE HELD UNDER THE PRESSURE OF SAID FLUID IN SAID OPERATIVE POSITION, AND TO BE URGED TOWARD SAID INOPERATIVE POSITION, (E) A FRONT TOP ROLLER AND AT LEAST A SINGLE BACK TOP ROLLER, EACH OF SAID ROLLERS BEING ROTATABLE AND MOVABLY MOUNTED ON SAID CARRIER ARM FOR COOPERATION WITH SAID BOTTOM ROLLER MEANS WHEN SAID CARRIER ARM IS IN OPERATIVE POSITION, (F) RIGID PRESSURE TRANSMITTING MEANS PROVIDED ON SAID CARRIER ARM MEANS DIRECTLY TRANSMITTING PRESSURE FROM SAID CARRIER ARMS MEANS, WHEN IN SAID OPERATIVE POSITION, TO SAID FRONT TOP ROLLER, AND (G) RESILIENT PRESSURE TRANSMITTING PRESSURE SAID CARRIER ARM MEANS FOR TRANSMITTING MEANS EXERTED BY SAID RESILIENT PRESSURE TRANSMITTING MEANS TO SAID BACK TOP ROLLER WHEN SAID CARRIER ARM MEANS IS IN SAID OPERATIVE POSITION. 